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13 cards from this deck
Magnetic fields
Concentric circles
Direction of conventional current
Direction of magnetic field lines
Conventional current (positive to negative)
Directly proportional: B∝IB \propto IB∝I (double current = double field)
Inversely proportional: B∝1dB \propto \frac{1}{d}B∝d1 (double distance = half field)
Long coil of insulated conducting wire
Strong and uniform
Bar magnet with N and S poles
Increases magnetic field strength
Creates electromagnet, much stronger field
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